Am I treating women with the same respect and consideration that I would treat a male team member?

No. My boss is a woman, and I'm the only male employee in the office (that matters, wubalubadubduuuub), so the question is trivial for me.

Do I make assumptions that my women classmates or team members or co-workers might not be as skilled or might be differently skilled that the males?

Also no. Generally female classmates are more pleasant to work with and more inclined to concentrate on the work that needs to be done than male classmates. Read: anecdotal. I'm also in tech so their only shield against sexism is probably being goal-oriented 100% of the time.

Am I assuming too many leadership roles without giving others a chance?

Lol, no. I avoid leadership roles like the plague. I am not a leader and I've come to terms with that.

Do I prefer men in the group to lead the projects?

Also no. Of the two bosses I've had, one being male, one being female, my female boss has been far easier to work with, more engaging, less critical, and more open to discussion.

What other assumptions am I making about the race, gender, ability, skills, intelligence of others? Is it possible that I am making assumptions without being aware of it?

Yes, but I'm not saying why here.

Am I building my personal skills to be a good citizen, parent, friend, son, brother, etc.?

I don't ask this question because I'm generally alone on any given day so the question doesn't need to be asked. At least, that's how I feel in the context of a normal day.